Canada’s prime minister hands millions to Omar Khadr, whose victims may not be able to collect. Omar Khadr pulled the pin from a grenade and tossed it at Sgt. First Class Christopher Speer, a U.S. Army Delta Force medic, on July 27, 2002. Those are the facts to which Mr. Khadr, a Canadian citizen, confessed when he pleaded guilty before a Guantanamo Bay war-crimes commission. For several years Mr. Khadr had been living and training with al Qaeda in Afghanistan under the tutelage of his father, Ahmed. The Khadrs reportedly lived in Osama bin Laden’s Kandahar-area compound. Speer died of his wounds 1½ weeks after the attack, which left another soldier, Sgt. First Class Layne Morris, partly blind. Mr. Khadr, badly wounded, was treated and transferred to the Cuba base. In 2012 the U.S. returned…